I think you're going for a CTF server, but Rocket Arena (or more specifically, the Clan Arena mode) is pretty much what you're describing. The stock game doesn't support things such as this. If you want the server to do this for you, you're going to need a server-side mod, I believe.
You could bind it to a key (ie, in your client's config file, /bind keyname give all) and press the key every respawn, but that might get tedious.
